AA3 type flow injection analyzer-based method for measuring total nitrogen content of soil

A technology of flow injection and measurement method, which is applied in the direction of analyzing materials through chemical reactions and material analysis through observing the influence of chemical indicators. Improve work efficiency and reduce the amount of use

Inactive Publication Date: 2011-07-20
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, when the soil sample digestion solution contains heavy metal ions such as iron and copper, the NaOH in the buffer w

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  • AA3 type flow injection analyzer-based method for measuring total nitrogen content of soil
  • AA3 type flow injection analyzer-based method for measuring total nitrogen content of soil
  • AA3 type flow injection analyzer-based method for measuring total nitrogen content of soil

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Embodiment Construction

[0018] The following is a detailed description of the embodiments of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0019] Eight soil samples in different soil layers were collected at different sampling points in Taoyuan, and the total nitrogen content in the soil was determined. Three parallel experiments were done for each sample. The collected soil samples were naturally air-dried indoors, ground to fineness (soil particle size no more than 1mm) with a soil grinder, and put into ziplock bags for later use.

[0020] 1. Reagent Preparation

[0021] (1) Sodium hypochlorite solution, alkaline phenate, buffer solution: Prepared according to the method for determining the content of ammonium nitrogen in water samples...

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Abstract

The invention discloses an AA3 type flow injection analyzer-based method for measuring total nitrogen content of soil in the technical field of environment detection. The method comprises the following steps of: oxidizing fresh soil sample granules by concentrated sulfuric acid and perchloric acid, performing fixed volume filtration, tanking out 2 to 3mL of filtrate, mixing the filtrate and 4mol/L of NaOH solution uniformly in equal volume, and filtering the mixed solution to obtain soil sample digestion solution; and preparing standard series solution with proper ammonium nitrogen according to the ammonium nitrogen concentration in the digestion solution, introducing the sample, measuring the ammonium nitrogen concentration in the soil sample digestion solution according to a method for measuring the ammonium nitrogen content of a water sample by using an AA3 type flow injection analyzer, and finally calculating the total nitrogen content of the soil sample. The method can quickly, accurately and massively measure the total nitrogen content of the soil of various types, and saves time and labor.

Description

technical field [0001] The invention relates to a method in the technical field of environmental detection, in particular to a method for measuring soil total nitrogen content based on an AA3 type flow injection analyzer. Background technique [0002] Soil total nitrogen content is an important indicator of soil fertility. It can not only reflect the nitrogen supply capacity and level of the soil, but also is closely related to the content of soil organic matter. Therefore, the determination of soil total nitrogen content has become an important basis for judging soil fertility. In agricultural production, according to the nitrogen content level of the field soil and its spatial distribution, precise and reasonable fertilization can not only reduce the amount of fertilizer used, improve its utilization rate, reduce the cost of agricultural production, but also effectively control agricultural non-point source pollution . [0003] For the determination of soil total nitroge...

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Application Information

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IPC IPC(8): G01N21/79
Inventor 周培王鲁梅黄海波毛亮
Owner SHANGHAI JIAO TONG UNIV
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